export function sleep(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

export async function eventually(assertFn: () => void, opts?: { timeoutMs?: number; intervalMs?: number }): Promise<void> {
  const timeoutMs = opts?.timeoutMs ?? 500;
  const intervalMs = opts?.intervalMs ?? 10;
  const start = Date.now();
  let lastErr: any = null;
  while (Date.now() - start < timeoutMs) {
    try {
      assertFn();
      return;
    } catch (e: any) {
      lastErr = e;
      await sleep(intervalMs);
    }
  }
  if (lastErr) throw lastErr;
}